JPH0834615B2 - Line state management control method in switching system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention monitors the state of a line by means of a line control signal sent from a terminal or an opposite exchange in an exchange system and sends a control signal to the terminal or the opposite exchange. The present invention relates to a line state management control method in a line state management control system for sending messages.

[Conventional technology]

In the conventional exchange line state management control method, the state transitions of all lines are managed by generating a single task for a program that performs a plurality of line state management controls and the data required by the programs. Here, the management of the line state transition is executed for the line based on the line control information sent from the terminal or the opposite exchange through the path corresponding to the line accommodated in the exchange and the current state of the line. This is a process of determining the process to be performed and executing the process, and then changing the state of the line to the next state.

In such a conventional method, if an interruption occurs while a task is running, the work area associated with the program may be used twice due to task activation for a call that occurred on another line. Therefore, the valid information of the work area that is being used for the call processing that was executed before the interruption is the TCRB (Task Control & Transaction Bloc)
k) There were many constraints that required processing to be saved on top, and extra effort was spent on program design.

[Problems to be solved by the invention]

The line state management control method in the conventional exchange system described above is a method in which the program for managing the state transition of the line and the data used by the program are activated by the generation of a call for all lines by the generation of a single task. As described above, when the task is interrupted, the work area must be saved and the recovery processing must be performed when the task is interrupted and resumed, and the overhead for that is large, and the program design is troublesome. It was

The present invention has solved the above-mentioned conventional drawbacks, and an object of the present invention is to provide a line state management control method in an exchange system having a small overhead and easy program design.

[Means for solving problems]

In order to achieve the above object, the present invention, as a line control processor constituting an exchange system, is a processor that realizes a multiple virtual space configuration that provides a storage device for storing an exchange processing program and data and a virtual address space for each task. And a line control processor equipped with an operating system for managing multiple virtual spaces on the processor, and line control information sent from the terminal or the opposite exchange through a path corresponding to the line accommodated in the exchange, and Different virtual spaces on the line control processor for determining a process to be executed for the line based on the current state of the line and executing the process and then changing the state of the line to the next state. This is performed by the line status management task that operates above and is assigned to each line.

[Action]

Since the state transition of the line is managed by a task that has a unique virtual address space and is prepared for each line, it is not necessary to save and restore the work area when the task is interrupted.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a functional block diagram of an embodiment of the present invention. This switching system includes a main switch 11 and line circuits 12 and 13.
, Call control processor 21, and line control processors 22, 23
It consists of and.

A path corresponding to the line accommodated in the exchange (there are the signal lines 31 and 32 of the call control processor 21 side and the direct line from the terminal or the opposite exchange, and the latter is the line circuit 12 and 13 side 2 through the signal lines 41, 42 of FIG. 2 or a connection signal line with a terminal or an opposite exchange (not shown in FIG. 2)). The information is transferred to the line control processors 22 and 23 via the channels 13 and 13. The line control processors 22 and 23 have a function of managing and controlling the state of each line, and have a function of sending a line control signal to a terminal of a communication partner or an opposite exchange via the call control processor 21.

FIG. 3 is a block diagram of an embodiment of the line control processors 22 and 23. The storage device 200 stores switching processing programs and data, and a micro computer for realizing a multiple virtual space configuration for providing a virtual address space for each task. Processor
Interface circuit 202 between 201 and the line circuits 12 and 13
Interface circuit 20 between the call control processor 21 and
It is composed of 3 and. An operating system (OS) that manages multiple virtual spaces runs on the microprocessor 201, and line control information and its line control information sent from a terminal or an opposite exchange through a path corresponding to a line accommodated in the exchange. Based on the current state of the line, determine the process to be executed for that line, and after executing this determined process, change the line state to the next state (management of line state transition). , The line status management task assigned to each line.
That is, a line state management task having a function of managing the state transition of the line accommodated in the exchange is generated for each line, and each line state management task has a function of managing only the state transition of the corresponding one line. Another task has a configuration in which the other task for receiving and identifying the line control information sent from the terminal or the opposite exchange through the path is distributed to each line state management task by a known inter-task communication technique.

FIG. 1 is a flow chart showing an example of the processing procedure of the line state management in the line control processors 22 and 23 of FIG. 2, and FIG. 4 is a related diagram of the functional modules for executing the process shown in FIG. In FIG. 4, 50 is a multi-task control management module, 51 is a D channel control module, 52 is an interprocessor communication control module, and 53 ₁
Numerals 53 to 53 _n are state management modules corresponding to the line circuit types, and a line state management task corresponding to a plurality of lines is generated in each state management module.

The line control processors 22 and 23 activate the multi-task control management module 50 shown in FIG. 4 as a pre-process for starting the switching service, and execute the initialization process shown in FIG. In this initialization processing, the type of the line circuits 12 and 13 is read from a hardware device (not shown) (processing procedure S
2), as the type information of the obtained line circuit parameters, in each type corresponding state control module 53 ₁ to 53 _n, to perform the generation of the line state management tasks for the corresponding line (procedure S3). Generation of such line state management tasks is performed for all lines, and when it is determined in step S1 that task generation for all lines has been completed, the initial setting procedure by the multitask control management module 50 ends.

Next, the procedure of line status management will be described. When the start task (START TASK) request having the line circuit type as a parameter is given after the task generation for all lines is completed, the multitask control management module 50 branches by the line circuit type passed as a parameter ( Processing procedure S2
0), by issuing a restart task (RESTART TASK) request to each state management module 53 _{1 to} 53 _n , each line state management task of the corresponding line type is started, and each state management module 53 _{1 to} 53 _n Causes the line state management task to manage line state transitions within an infinite loop specific to the line circuit type. In Figure 1, ISDN (Integrated Service)
s Digital Network) The processing procedure is shown only for the idle state (state number "1") and the response waiting state (state number "2") of the state management of the line connected to the terminal. The processing procedure in other states is omitted.

Now, in the infinite loop, each line state management task first branches according to the line number of the line state (procedure S21),
It has a message signal expected to be received in each state (procedure S22, S25). If the line circuit type is an ISDN terminal, the line state management task is restarted, and in the process of first determining the state number (procedure S21), it is determined that the state number "1" is an empty state. The line status management task is interrupted while waiting for an empty signal (processing procedure
S22).

The above processing is executed for all lines, and all tasks wait for an empty signal and wait for a signal for calling or receiving a call from the corresponding line.

Next, when the line circuits 12 and 13 in FIG. 2 detect a call signal from the ISDN terminal, the call signal is sent to the line control processors 22 and 23. In the line control processors 22 and 23, this calling signal is received by the D channel control module 51, and the D channel control module 51 responds to this by issuing a line state management task corresponding to the line, for example, in the line / task correspondence table. The line state management task identifies the message based on the contents and notifies the corresponding line state management task of the message by the inter-task communication technology. The line state management task recognizes this as SETUP in FIG. 1 and executes the call detection process of process step S23. Run.

When an incoming call signal is sent from the call control processor 21 of FIG. 2 to the line control processor 12.13, the incoming call signal is received by the inter-processor communication control module 52,
The module 52 notifies the corresponding line state management task of the message by the inter-task communication technology, and the line state management task recognizes this as the IAM of FIG. 1 and executes the incoming call process of the processing procedure S24. Run. When it is necessary to send a control signal to the terminal or the opposite exchange as a result of the above-mentioned call detection processing or call reception processing, the line state management task is controlled by the D channel control module 51 or the interprocessor communication control module 52. Pass signals and send them to the path of the corresponding line.

After that, when the incoming call processing of the processing procedure S24 is completed, the next state number of the corresponding line, that is, the response waiting state of "2" is set (processing procedure S28), and the corresponding line state management task waits for the response of the processing procedure S25. Suspended. And from the ISDN terminal AL
When the ERT is detected, the response detection processing of the processing procedure S26 is executed, and when the disconnection signal REL is received from the call control processor 21 of FIG. 2, the midway abandonment detection processing of the processing procedure S27 is executed.

〔The invention's effect〕

As described above, since the line state management control method in the exchange system of the present invention assigns line state management tasks that operate in different virtual spaces corresponding to the lines, the work area is saved and restored when the tasks are interrupted. No processing is required, the overhead is reduced, and the line state management control program can be easily created.

[Brief description of drawings]

FIG. 1 is a flow chart showing an example of a processing procedure of line state management in the line control processors 22 and 23, FIG. 2 is a functional block diagram of an embodiment of the present invention, and FIG. 3 is an embodiment of the line control processors 22 and 23. FIG. 4 and FIG. 4 are related diagrams of functional modules that execute the processing of FIG. In the figure, 11 ... Main switch, 12,13 ... Line circuit, 2
1 …… Call control processor, 22,23 …… Line control processor, 31,32,41,42 …… Signal line, 50 …… Multitask control management module, 51 …… D channel control module, 52
...... Interprocessor communication control module, 53 _{1 to} 53 _n …… State management module, 200 …… Storage device, 201 …… Microprocessor, 202,203 …… Interface circuit.

Claims (1)

[Claims] 1. A line control processor constituting a switching system, a storage device for storing switching processing programs and data, a processor for realizing a multiple virtual space configuration for providing a virtual address space for each task, and a multiple processor on the processor. Using the line control processor equipped with an operating system for managing the virtual space, line control information sent from the terminal or the opposite exchange through the path corresponding to the line accommodated in the exchange and the current state of the line A process of determining a process to be executed for the line based on the above, and executing a process of changing the state of the line to the next state, which operates in different virtual spaces on the line control processor. A switching system characterized by performing a line status management task assigned to each line Line state management control how.